List bullet contents mostly deleted after ENTER + ENTER + BACKSPACE + ENTER

[mrwweb]

Describe the bug
When escaping a list through multiple returns (which doesn't always work), back spacing into a list, and hitting return again, I lose a majority of the data in my list.

I observed this bug a few other times in other conditions but this series of keystrokes is the only one I could consistently reproduce. In working on a blog post, I completely lost a bullet's contents twice and trying to UNDO/REDO to get it back did not work.

To Reproduce

1. Make a list
2. Hit RETURN twice to escape the list (doesn't always work)
3. Hit BACKSPACE to return cursor to end of last bullet
4. Hit RETURN
5. All but the first few characters in the last bullet are lost.

Expected behavior
Gutenberg doesn't delete what I've written :(

Screenshots

To be extra sure this was really happening, I did it twice in two separate posts.

Desktop (please complete the following information):

• Win 10
• Firefox 63
• 5.0-beta1-43823

[dbullock]

I was able to recreate this with Gutenberg Version 4.1.1 .. WP beta1-43832 .. in Chrome

[allieryn]

I was partially able to recreate this issue. It was not consistent with this set of steps. However, while going in and out of the list block, I had similar results. I was unable to reproduce those errors again, though.

OS X 10.14
Chrome 69
5.0-beta1-43832
Twenty Seventeen
No plugins

[mrwweb]

I was partially able to recreate this issue. It was not consistent with this set of steps.

The ENTER + ENTER + BACKSPACE + ENTER seems to be the most consistent way I can trigger it, but I've definitely seen it happen in other circumstances as well.

[youknowriad]

Should be fixed by #10799